For this canna oil recipe you will first of all need to grind up your weed into a fine dust.
Using a funnel, or a make your own from paper. Put the weed directly into the bottle of oil.
The more weed you put in the stronger the potency of the oil will be. If possible try to find a darker olive oil as this will be slightly better for extracting THC.
The canna oil can be stored for a month at least. The longer it is left the more potent it will become as the oil has more time to extract the THC from the weed.